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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/hr °C
kcal/m hr °C
kcal/m² hr °C
kcal/m²

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Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Higher
Lower
Depends upon the shape of body
Same

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Stanton number
Peclet number
Nusselt number
Biot number

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Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = k/ ρS
h = S/ρk
h = ρS/k
h = kρ/S

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Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Cmin/U
U/A.Cmin
U/Cmin
U.Cmin

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Heat and Mass Transfer
Fouling factor is used

In heat exchanger design as a safety factor
In case of Newtonian fluids
When a liquid exchanges heat with a gas
None of these

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